bcd-date

Node.js package to decode BCD datetime buffers used by Siemens and Rockwell PLCs into a normal javascript date objects.

The format of the BCD date is as follows

Byte	Contents	Range
0	Year	90-89
1	Month	1-12
2	Day	1-31
3	Hour	0-23
4	Minute	0-59
5	Second	0-59
6	2 MSD of ms	0-99
7 (1st nibble)	LSD of ms	0-9
7 (2nd nibble)	Day of week (unused)	1-7

example

var bcdDate = require('bcd-date');

var buffer = new Buffer('1012231130301235', 'hex');

var date   = bcdDate.decode(buffer);
var buffer = bcdDate.encode(date);

// date   == date at 2010-12-23 11:30:30.123
// buffer == buffer of 1012231130301235

// decode as UTC
var date = bcdDate.decode(buffer, true);

// encode as UTC
var date = bcdDate.encode(buffer, true);